[omer_balyali]

Syntorial is a charm, definitely the best resource to develop your ear. There are possibly waay extensive resources like books, but as the nature of the medium it's good for getting information, but for practice and developing the ear, Syntorial is #1.

[comboy]

It's a different thing but I've had some fun with https://tonedear.com/ training my imperfect pitch.

[esistgut]

I'm trying to learn guitar in my 30s and I'm really struggling with the ear training parts. Can you point other resources like this one?

[basq]

I'll also vouch for syntorial. Completed the demo years ago and I still use those techniques every day.